Spring is the season for the recovery of all things, and some weeds are beginning to emerge. Excessive weeds in wheat fields affect the normal growth of wheat, compete with water for wheat, compete for fertilizer, contend for light and fight for space, and remove it as soon as possible. Herbicides have the advantages of saving time and labor, cost saving, and good weeding efficacy in the control of wheat field weeds. Improper application may also result in insignificant weeding effects or phytotoxicity, as well as harm to the crop after planting. Wheat chemical weeding is best carried out in the tillering period of the year before. After the year, it is generally in the spring return period. We must pay attention to the following points:
1. Note the herbicide selection. Various herbicides have a certain degree of selectivity in controlling weeds, and the agents that have good control effects on broad-leaved weeds in wheat are bifloxacin (Mei Xi) and fluoxyl (Lenglong). Tribenuron (superstar) and other herbicides. The control of wild oats, bromegrass, Aegilops wilfordii and other monocotyledonous weeds can be used methylsulfuron (Smar), ff oxazolone (Puma).
2. According to weather conditions. The use of wheat herbicides should be carried out on a sunny, windless, or breezy day. If the wind is too strong, it is difficult to ensure the accuracy of the pesticide application. The droplets are also likely to cause phytotoxicity to other crops in the surrounding areas. It is generally applied between 9:00 am and 5:00 pm, and heavy rain is needed for rain within 6 hours after spraying.
3. According to the temperature at the right time. The use of wheat herbicides should also pay attention to the temperature at the time of spraying. Only when the temperature reaches a certain temperature, the wheat herbicide can be effectively absorbed by the weeds to produce a weeding effect. General requirements of the temperature above 15 °C, the temperature is lower than 10 °C, poor weeding effect, easy to produce phytotoxicity.
4. Strictly control the dosage. In order to ensure that herbicides kill weeds without damaging wheat seedlings, we must strictly control the dosage and cannot increase the dosage arbitrarily. Generally, 50 kg of water per mu is sprayed. If the surface of the soil is dry, the amount of water can be increased appropriately.
5 pay attention to master the application of technology. Wheat herbicide spraying nozzle from the top of wheat seedlings 20cm, inverted spray, requiring uniform spraying, no spray does not spray. Do not spray on wheat crops with other herbicide-sensitive crops. Wheat seedlings are thin, and wheat fields that are poorly grown should not be sprayed. Herbicides cannot be randomly mixed with insecticides or fungicides. Herbicides should not be used for a long time as they are used with them to prevent them from reducing their efficacy. The used sprayer should be rinsed and it is best to use it to prevent damage to other crops. After the jointing of wheat, more weeds have been removed by hand, and weeds cannot be chemically weeded, which may cause injury to wheat. Chemical weeding in the spring prohibits the use of long residual herbicides such as chlorsulfuron, metsulfuron, and the like, which produce phytotoxicity on the crops of the after crop.
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